Effect of post-processes on the microstructure and mechanical properties of laser powder bed fused IN718 superalloy

The post-processing on the additively manufactured component is of huge interest as key to tailor microstructure obtain certain mechanical properties. In this present study, effects hot isostatic pressing, well heat treatment microstructure, phase configuration and properties laser powder bed fused (LPBF) IN718 superalloy were systematically investigated. Three different post-processes studied such pressing (HIP), (HT), HIP followed by HT (HIP+HT). process effectively eliminated Laves remained in as-built brought uniformly distributed super fine γ″ precipitates nano-meter size. heat-treated larger promoted directly from material. comparison HIP+HT caused a moderate growth γ″. latter two cases, developed significantly strengthened Yield strength was increased 738 MPa condition 1015 1184 after HIP+HT, respectively. On contrary ductility reduced more than 40% HIP+HT. This can be compared an increase almost 30% when subjected specimens only HIPping. Finally, correlation between evolution discussed detail.